This series of Celerons is based on the Pentium III Tualatin core, and made with a 0.13 µ process. They were nicknamed Tualeron. The series began with 1000 and 1100 MHz parts (which were given the extension "A" to their name to differentiate them from the Coppermine-128 of the same speed they replaced) and the line continued with 1200, 1300, and 1400 MHz chips.
Tualerons are identical to their fully-fledged Pentium III sibling, except that they use a 100 MHz bus rather than a 133 MHz bus. They are excellent overclockers, since they have higher multipliers and users could put them on a 133 MHz bus easily. The cache is the same as in the Pentium III; 256KB in both.